Distributed deformation across the Rio Grande Rift, Great Plains, and Colorado Plateau

被引：58

作者：

Berglund, Henry T. ^{[1
]}

Sheehan, Anne F. ^{[2
]}

Murray, Mark H. ^{[3
]}

Roy, Mousumi ^{[4
]}

Lowry, Anthony R. ^{[5
]}

Nerem, R. Steven ^{[6
]}

Blume, Frederick ^{[1
]}

机构：

[1] UNAVCO Inc, Boulder, CO 80301 USA

[2] Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA

[3] New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA

[4] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA

[5] Utah State Univ, Dept Geol, Logan, UT 84322 USA

[6] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA

来源：

GEOLOGY | 2012年 / 40卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

WESTERN UNITED-STATES; UPPER-MANTLE; NEW-MEXICO; P-WAVE; BENEATH; TOMOGRAPHY; EXTENSION; SOCORRO; UPDATE; BASIN;

D O I：

10.1130/G32418.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

We use continuous measurements of GPS sites from across the Rio Grande Rift, Great Plains, and Colorado Plateau to estimate present-day surface velocities and strain rates. Velocity gradients from five east-west profiles suggest an average of similar to 1.2 nanostrains/yr east-west extensional strain rate across these three physiographic provinces. The extensional deformation is not concentrated in a narrow zone centered on the Rio Grande Rift but rather is distributed broadly from the western edge of the Colorado Plateau well into the western Great Plains. This unexpected pattern of broadly distributed deformation at the surface has important implications for our understanding of how low strain-rate deformation within continental interiors is accommodated.

引用

页码：23 / 26

页数：4

共 27 条

[1] Tests of the rigid-plate hypothesis and bounds on intraplate deformation using geodetic data from very long baseline interferometry [J].